fix(tauri): replace silent let _ = with structured logging across 20 modules

Replace error-swallowing let _ = patterns with tracing::warn! in browser,
classroom, gateway, intelligence, memory, pipeline, secure_storage, and
viking command handlers. Ensures errors are observable in production logs.

desktop/src-tauri/src/memory_commands.rs

@@ -45,6 +45,7 @@ pub struct MemorySearchOptions {
 ///
 /// Now a no-op for storage (VikingStorage initializes itself in viking_commands).
 /// Only initializes PersistentMemoryStore for backward-compatible embedding config.
+// @connected
 #[tauri::command]
 pub async fn memory_init(
     app_handle: AppHandle,
@@ -60,6 +61,7 @@ pub async fn memory_init(
 /// Store a new memory
 ///
 /// Writes to VikingStorage (SqliteStorage) with FTS5 + TF-IDF indexing.
+// @connected
 #[tauri::command]
 pub async fn memory_store(
     entry: MemoryEntryInput,
@@ -125,6 +127,7 @@ fn to_persistent(entry: &zclaw_growth::MemoryEntry) -> PersistentMemory {
 }
 
 /// Get a memory by ID (URI)
+// @connected
 #[tauri::command]
 pub async fn memory_get(
     id: String,
@@ -141,6 +144,7 @@ pub async fn memory_get(
 /// Search memories
 ///
 /// Uses VikingStorage::find() for FTS5 + TF-IDF + optional embedding search.
+// @connected
 #[tauri::command]
 pub async fn memory_search(
     options: MemorySearchOptions,
@@ -182,6 +186,7 @@ pub async fn memory_search(
 /// Delete a memory by ID (URI)
 ///
 /// Deletes from VikingStorage only (PersistentMemoryStore is no longer primary).
+// @connected
 #[tauri::command]
 pub async fn memory_delete(
     id: String,
@@ -195,6 +200,7 @@ pub async fn memory_delete(
 }
 
 /// Delete all memories for an agent
+// @connected
 #[tauri::command]
 pub async fn memory_delete_all(
     agent_id: String,
@@ -222,6 +228,7 @@ pub async fn memory_delete_all(
 }
 
 /// Get memory statistics
+// @connected
 #[tauri::command]
 pub async fn memory_stats(
     _state: State<'_, MemoryStoreState>,
@@ -278,6 +285,7 @@ pub async fn memory_stats(
 }
 
 /// Export all memories for backup
+// @connected
 #[tauri::command]
 pub async fn memory_export(
     _state: State<'_, MemoryStoreState>,
@@ -299,6 +307,7 @@ pub async fn memory_export(
 /// Import memories from backup
 ///
 /// Converts PersistentMemory entries to VikingStorage MemoryEntry and stores them.
+// @connected
 #[tauri::command]
 pub async fn memory_import(
     memories: Vec<PersistentMemory>,
@@ -343,6 +352,7 @@ pub async fn memory_import(
 /// Get the database path
 ///
 /// Now returns the VikingStorage (SqliteStorage) path.
+// @connected
 #[tauri::command]
 pub async fn memory_db_path(
     _state: State<'_, MemoryStoreState>,
@@ -354,6 +364,7 @@ pub async fn memory_db_path(
 
 /// Configure embedding for PersistentMemoryStore (chat memory search)
 /// This is called alongside viking_configure_embedding to enable vector search in chat flow
+// @reserved: 暂无前端集成
 #[tauri::command]
 pub async fn memory_configure_embedding(
     provider: String,
@@ -388,6 +399,7 @@ pub async fn memory_configure_embedding(
 }
 
 /// Check if embedding is configured for PersistentMemoryStore
+// @reserved: 暂无前端集成
 #[tauri::command]
 pub fn memory_is_embedding_configured() -> bool {
     is_embedding_configured()
@@ -396,6 +408,7 @@ pub fn memory_is_embedding_configured() -> bool {
 /// Build layered memory context for chat prompt injection
 ///
 /// Uses VikingStorage (SqliteStorage) with FTS5 + TF-IDF + optional Embedding.
+// @connected
 #[tauri::command]
 pub async fn memory_build_context(
     agent_id: String,